Karl Barth / public faith.

"Faith means choosing between faith and unbelief, wrong belief and superstition. Faith is the act in which man relates himself to God as is appropriate to God. For this work takes place in a stepping out of neutrality towards God, out of any disavowal of obligation towards Him in our existence and attitude, out of the private sphere, into resoluteness, responsibility and public life. Faith without this tendency to public life, faith that avoids this difficulty, has become in itself unbelief, wrong belief, superstition. For faith that believes in God the Father, the Son and the Holy Spirit cannot refuse to become public."

-Karl Barth, in Dogmatics in Outline